Where is fluid bake completion time reported?
I don't know of any bake times being displayed.

To work out the bake time of a simulation that you have already baked, look in the cache folder and compare the earliest modified date to the latest modified date, the difference is how long it took to bake.

It isn't hard to setup a timer yourself. Rather than start the bake by pressing the bake button, you use a simple script that runs the bake operator and has timing around it.

import bpy
import time

startTime = time.process_time()
bpy.ops.fluid.bake()
timeToBake = time.process_time() - startTime

print("Time to bake the fluid sim was",timeToBake,"seconds")


This will print the time to the console - that is the terminal you started blender in. Alternatively you can paste the above code into blenders python console to see the result there when it is finished.

You also use wallclock timing with something like --

print("Start - ",time.strftime("%Y-%m-%d %H:%M:%S"))
print("End   - ",time.strftime("%Y-%m-%d %H:%M:%S"))


around the fluid.bake